<template>
    <div class="app-container">

        <h2 style="text-align: center;">发布新课程</h2>

        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
            <el-step title="填写课程基本信息"/>
            <el-step title="创建课程大纲"/>
            <el-step title="最终发布"/>
        </el-steps>

        <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="(chapter) in chapterVideoList" :key="chapter.id">
                <p>
                    {{ chapter.title }}
                    <span class="acts">
                        <el-button type="primary" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button type="info" @click="openEditChatper(chapter.id)">编辑</el-button>
                        <el-button type="danger" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>
                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li
                        v-for="video in chapter.eduVideoList"
                        :key="video.id">
                        <p>{{ video.title }}

                            <span class="acts">
                                <el-button type="info" @click="editVideo(video.id)">编辑</el-button>
                                <el-button type="danger" @click="removeVideo(video.id)">删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>

        <el-form>

            <el-form-item>
                <el-button @click="previous">上一步</el-button>
                <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
            </el-form-item>

        </el-form>

        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title"/>
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">

            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title"/>
                </el-form-item>

                <el-form-item label="课时排序">
                    <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
                </el-form-item>

                <el-form-item label="是否免费">
                    <el-radio-group v-model="video.isFree">
                        <el-radio :label="true">免费</el-radio>
                        <el-radio :label="false">默认</el-radio>
                    </el-radio-group>
                </el-form-item>

                <el-form-item label="上传视频">
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API+'eduvideo/video/uploadVideo'"
                        :limit="1"
                        class="upload-demo">
                    <el-button size="small" type="primary">上传视频</el-button>
                    <el-tooltip placement="right-end">
                        <div slot="content">最大支持1G，<br>
                            支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                            GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                            MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                            SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                        <i class="el-icon-question"/>
                    </el-tooltip>
                    </el-upload>
                </el-form-item>
            </el-form>

            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
            </div>
        </el-dialog>

    </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    
    data(){
        return {
            saveBtnDisabled:false,
            saveVideoBtnDisabled:false,
            courseId:'',//课程id
            chapterVideoList:[],
            chapter:{ //封装章节数据
                id:'',
                title: '',
                sort: 0
            },
            video: {
                id:'',
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName:''//视频名称
            },
            dialogChapterFormVisible:false,//章节弹框
            dialogVideoFormVisible:false, //小节弹框

            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    methods:{
        init(){
            chapter.getList(this.courseId).then(response=>{
                this.chapterVideoList = response.data.data;
            })
        },
        // 添加章节（显示弹窗）
        openChapterDialog(){
            this.dialogChapterFormVisible = true;
            this.chapter = { //封装章节数据
                courseId:this.courseId,
                id:'',
                title: '',
                sort: 0
            };
        },
        // 保存章节（添加/更新）
        saveOrUpdate(){
            console.log(this.chapter);
            if(this.chapter.id==''){
                chapter.save(this.chapter).then(response=>{
                    this.init();
                })
            }else{
                chapter.update(this.chapter).then(response=>{
                    this.init();
                })
            }
            this.dialogChapterFormVisible = false;

        },
        // 修改章节（显示弹窗）
        openEditChatper(id){
            this.dialogChapterFormVisible = true;
            chapter.info(id).then(response=>{
                this.chapter = response.data.info;
            })
        },
        // 删除章节（弹窗提示）
        removeChapter(id){

            this.$confirm('此操作将永久删除, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                for(let i = 0;i<this.chapterVideoList.length;i++){
                    if(this.chapterVideoList[i].id==id){
                        if(this.chapterVideoList[i].eduVideoList.length>=0){
                            chapter.deletet(id).then(response=>{
                                this.init();
                                this.$message({
                                    type: 'success',
                                    message: '删除成功!'
                                });
                                return;
                            })
                        }
                    }
                }
                this.$message({
                    type: 'success',
                    message: '该章节存在小节，无法删除！'
                });
            }).catch(() => {});
            
        },

        // 添加小结（显示弹窗）
        openVideo(id){
            this.dialogVideoFormVisible = true;
            this.video = {
                courseId:this.courseId,
                chapterId:id,
                id:'',
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName:''//视频名称
            }
        },
        // 编辑小结
        editVideo(id){
            this.dialogVideoFormVisible = true;
            video.info(id).then(response=>{
                this.video = response.data.info;
            })
        },
        //删除小结
        removeVideo(id){
             this.$confirm('此操作将永久删除, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                video.delete(id).then(response=>{
                    this.init();
                    this.$message({
                        type: 'success',
                        message: '删除成功！'
                    });
                })
            }).catch(() => {});
        },
        // 保存小结（添加/更新）
        saveOrUpdateVideo(){
            console.log(this.video);
            (this.video.id==''?video.save(this.video):video.update(this.video))
                .then(response=>{
                    //把文件列表清空
                    this.fileList = [];
                    this.init();
                    this.$message({
                        type: 'success',
                        message: '添加成功'
                    });
                    this.dialogVideoFormVisible = false;
                })
        },
        /**
         *              :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
         */
        //上传成功
        handleVodUploadSuccess(response, file, fileList){
            console.log("response.data.videoId" ,response.data.videoId);
            //上传视频id赋值
            this.video.videoSourceId = response.data.videoId;
            //上传视频名称赋值
            this.video.videoOriginalName = file.name;
        },
        //删除视频
        handleVodRemove(){
            video.deleteAliyunvod(this.video.videoSourceId).then(response=>{
                //提示信息
                this.$message({
                    type: 'success',
                    message: '删除视频成功!'
                });
                //把文件列表清空
                this.fileList = [];
                //上传视频id赋值
                this.video.videoSourceId = '';
                //上传视频名称赋值
                this.video.videoOriginalName = '';
            })
        },
        //删除视频之前，提示信息
        beforeVodRemove(file,fileList) {
            return this.$confirm(`确定移除 ${ file.name }？`);
        },
        //存在视频时，还点击上传视频
        handleUploadExceed(){
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        //上一步
        previous(){
            this.$router.push({path:'/course/info/'+this.courseId});
        },
        //下一步
        next(){
            this.$router.push({path:'/course/publish/'+this.courseId});
        },

    },
    created(){
        if(this.$route.params&&this.$route.params.id){
            this.courseId = this.$route.params.id;
            this.init();
        }
    }

}
</script>

<style scoped>

.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
  list-style: none;
}
.chanpterList p{
  /* float: left; */
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  /* float: left; */
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>